public LightningEnvironment(string directory, EnvironmentOpenFlags openFlags, UnixAccessMode accessMode = UnixAccessMode.Default)
{
if (String.IsNullOrWhiteSpace(directory))
throw new ArgumentException("Invalid directory name");
IntPtr handle = default(IntPtr);
Native.Execute(lib => lib.mdb_env_create(out handle));
_shouldDispose = true;
_handle = handle;
_accessMode = accessMode;
this.Directory = directory;
_openFlags = openFlags;
_mapSize = DefaultMapSize;
_maxDbs = DefaultMaxDatabases;
_openedDatabases = new ConcurrentDictionary<string, LightningDatabase>();
_databasesForReuse = new HashSet<uint>();
ConverterStore = new ConverterStore();
var defaultConverters = new DefaultConverters();
defaultConverters.RegisterDefault(this);
}
/// <summary>
/// Open the environment.
/// </summary>
public void Open(EnvironmentOpenFlags openFlags = EnvironmentOpenFlags.None, UnixAccessMode accessMode = UnixAccessMode.Default)
{
if (IsOpened)
{
throw new InvalidOperationException("Environment is already opened.");
}
if (!openFlags.HasFlag(EnvironmentOpenFlags.NoSubDir) && !Directory.Exists(Path))
{
Directory.CreateDirectory(Path);
}
if (openFlags.HasFlag(EnvironmentOpenFlags.NoSubDir) && !Directory.Exists(System.IO.Path.GetDirectoryName(Path)))
{
Directory.CreateDirectory(System.IO.Path.GetDirectoryName(Path));
}
try
{
mdb_env_open(_handle, Path, openFlags, accessMode);
}
catch (Exception ex)
{
throw new LightningException($"Failed to open environment at path {Path}", ex);
}
IsOpened = true;
}
/// <summary>
/// Open the environment.
/// </summary>
public void Open(EnvironmentOpenFlags openFlags = EnvironmentOpenFlags.None, UnixAccessMode accessMode = UnixAccessMode.Default)
{
if (IsOpened)
{
throw new InvalidOperationException("Environment is already opened.");
}
if (!Directory.Exists(Path))
{
Directory.CreateDirectory(Path);
}
mdb_env_open(_handle, Path, openFlags, accessMode);
IsOpened = true;
}
/// <summary>
/// Creates a new instance of Environment.
/// </summary>
/// <param name="directory">Relative directory for storing database files.</param>
/// <param name="openFlags">Database open options.</param>
/// <param name="accessMode">Unix file access privelegies (optional). Only makes sense on unix operationg systems.</param>
/// <param name="disableAsync">Disable dedicated writer thread and NO_TLS option.
/// Fire-and-forget option for write transaction will throw.
/// .NET async cannot be used in transaction body. True by default. </param>
/// <param name="disableReadTxnAutoreset">Abort read-only transactions instead of resetting them. Should be true for multiple (a lot of) processes accessing the same env.</param>
public static LMDBEnvironment Create(string directory,
LMDBEnvironmentFlags openFlags = LMDBEnvironmentFlags.None,
UnixAccessMode accessMode = UnixAccessMode.Default,
bool disableAsync = true, bool disableReadTxnAutoreset = false)
{
#pragma warning disable 618
openFlags = openFlags | LMDBEnvironmentFlags.NoTls;
#pragma warning restore 618
// this is machine-local storage for each user.
if (string.IsNullOrWhiteSpace(directory))
{
throw new ArgumentNullException(nameof(directory));
}
var env = _openEnvs.GetOrAdd(directory, (dir) => new LMDBEnvironment(dir, openFlags, accessMode, disableAsync, disableReadTxnAutoreset));
if (env._openFlags != openFlags || env._accessMode != accessMode)
{
throw new InvalidOperationException("Environment is already open in this process with different flags and access mode.");
}
env._instanceCount++;
return(env);
}
public static int mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode)
{
return(check(LmdbMethods.mdb_env_open(env, path, flags, mode)));
}
int INativeLibraryFacade.mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode)
{
return FallbackLibraryFacade.mdb_env_open(env, path, flags, mode);
}
private static extern int mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode);
private LMDBEnvironment(string directory,
LMDBEnvironmentFlags openFlags = LMDBEnvironmentFlags.None,
UnixAccessMode accessMode = UnixAccessMode.Default,
bool disableWriterThread = false,
bool disableReadTxnAutoreset = false)
{
NativeMethods.AssertExecute(NativeMethods.mdb_env_create(out var envHandle));
_handle = envHandle;
_accessMode = accessMode;
_disableReadTxnAutoreset = disableReadTxnAutoreset;
_directory = directory;
_openFlags = openFlags;
try
{
CreateDirectoryIfMissing();
}
catch
{
NativeMethods.mdb_env_close(envHandle);
throw;
}
MaxDatabases = Config.DbEnvironment.DefaultMaxDatabases;
// Writer Task
// In the current process writes are serialized via the blocking queue
// Accross processes, writes are synchronized via WriteTxnGate (TODO!)
_cts = new CancellationTokenSource();
if (!disableWriterThread)
{
_writeQueue = new BlockingCollection <Delegates>();
var threadStart = new ThreadStart(() =>
{
while (!_writeQueue.IsCompleted)
{
try
{
// BLOCKING
var delegates = _writeQueue.Take(_cts.Token);
var transactionImpl = TransactionImpl.Create(this, TransactionBeginFlags.ReadWrite);
try
{
// TODO for some methods such as mbd_put we should have a C method
// that begins/end txn automatically
// we still need to pass call to it here, but we could avoid txn creation
// and two P/Invokes
var txn = new Transaction(transactionImpl);
if (delegates.WriteFunction != null)
{
var res = delegates.WriteFunction(txn);
delegates.Tcs?.SetResult(res);
}
else if (delegates.WriteAction != null)
{
delegates.WriteAction(txn);
delegates.Tcs?.SetResult(null);
}
else
{
Environment.FailFast("Wrong writer thread setup");
}
}
catch (Exception e)
{
delegates.Tcs?.SetException(e);
transactionImpl?.Abort();
}
finally
{
transactionImpl?.Dispose();
}
}
catch (InvalidOperationException)
{
}
}
_writeTaskCompletion.SetResult(null);
});
var writeThread = new Thread(threadStart)
{
Name = "LMDB Writer thread",
IsBackground = true
};
writeThread.Start();
}
}
public static extern int mdb_env_open(EnvironmentHandle env, IntPtr path, LMDBEnvironmentFlags flags, UnixAccessMode mode);
internal static extern int mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode);
public static int mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode)
{
return check(LmdbMethods.mdb_env_open(env, path, flags, mode));
}
int INativeLibraryFacade.mdb_env_open(IntPtr env, string path, EnvironmentOpenFlags flags, UnixAccessMode mode)
{
return(FallbackLibraryFacade.mdb_env_open(env, path, flags, mode));
}
/// <summary>
/// Open the environment.
/// </summary>
public void Open(EnvironmentOpenFlags openFlags = EnvironmentOpenFlags.None, UnixAccessMode accessMode = UnixAccessMode.Default)
{
if(IsOpened)
throw new InvalidOperationException("Environment is already opened.");
if (!openFlags.HasFlag(EnvironmentOpenFlags.NoSubDir) && !Directory.Exists(Path))
Directory.CreateDirectory(Path);
try
{
mdb_env_open(_handle, Path, openFlags, accessMode);
}
catch(Exception ex)
{
throw new LightningException($"Failed to open environment at path {Path}", ex);
}
IsOpened = true;
}
/// <summary>
/// Open the environment.
/// </summary>
public void Open(EnvironmentOpenFlags openFlags = EnvironmentOpenFlags.None, UnixAccessMode accessMode = UnixAccessMode.Default)
{
if(IsOpened)
throw new InvalidOperationException("Environment is already opened.");
if (!Directory.Exists(Path))
Directory.CreateDirectory(Path);
mdb_env_open(_handle, Path, openFlags, accessMode);
IsOpened = true;
}